The new particles in this case aren't "smaller" than the ones we already know about. They are short-lived because they are heavier. They quickly decay into some

The new particles in this case aren't "smaller" than the ones we already know about. They are short-lived because they are heavier. They quickly decay into something simpler. Extraordinary claims need extraordinary evidence. This article doesn't really describe anything that unexpected. It's not that hard to believe.